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Numerical growth of emittance in simulations of laser-wakefield acceleration

Abstract : Transverse emittance is a crucial feature of laser-wakefield accelerators, yet accurately reproducing its value in numerical simulations remains challenging. It is shown here that, when the charge of the bunch exceeds a few tens of picocoulombs, particle-in-cell (PIC) simulations erroneously overestimate the emittance. This is mostly due the interaction of spurious Cherenkov radiation with the bunch, which leads to a steady growth of emittance during the simulation. A new computational scheme is proposed, which is free of spurious Cherenkov radiation. It can be easily implemented in existing PIC codes and leads to a substantial reduction of the emittance growth.
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Submitted on : Monday, July 13, 2015 - 1:57:33 PM
Last modification on : Tuesday, October 5, 2021 - 9:00:02 PM
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R. Lehe, Agustin Lifschitz, Cédric Thaury, Victor Malka, X. Davoine. Numerical growth of emittance in simulations of laser-wakefield acceleration. Physical Review Special Topics - Accelerators and Beams, 2013, 16 (2), pp.021301. ⟨10.1103/PhysRevSTAB.16.021301⟩. ⟨hal-01163776⟩

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